Lời Giải
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Lời Giải
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Ví dụ phổ biến
Pawnee and Springfield are 420 miles apart. A train leaves Pawnee heading to Springfield at the same time a train leaves Springfield heading to Pawnee. One train is moving at a speed of 45 mph, and the other is moving 60 mph. How long will they travel before they meet?A person invests 8000 dollars in a bank. The bank pays 6.5% interest compounded quarterly. To the nearest tenth of a year, how long must the person leave the money in the bank until it reaches 10500 dollars?The diameter of a circle is 12 miles. What is the circle's chu vi?Tommy is 4 years older than Ron. 8 years ago, Tommy was 5 times as old as Ron. Find Ron's present age.5 more than three times a number is 35